摘要：
http://topic.csdn.net/u/20100323/18/d8e43d16-5884-4483-8928-5e3fb72988c2.html我知道了，我拷贝代码的时候不小心嵌套了两个form，哎。。急死我了。检查代码中是否重复报错的内容。 阅读全文
摘要：
A delegate is a reference type, like the other reference types you've seen in this book, but instead of referring to an object, a delegate refers to a method. This is called encapsulating the method. When you create the delegate, you specify a method signature and return type; you can encapsulat 阅读全文